Скачать или смотреть How to Reverse a String Word by Word While Excluding the Last Letter

Discover how to effectively reverse a string word by word, excluding the last character of each word. Learn to implement this in Java with step-by-step guidance.
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This video is based on the question https://stackoverflow.com/q/64052140/ asked by the user 'ANSHUMAN MISHRA' ( https://stackoverflow.com/u/10335534/ ) and on the answer https://stackoverflow.com/a/64052289/ provided by the user 'Prateek Srivastava' ( https://stackoverflow.com/u/12519110/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Reverse a String Word by Word While Excluding the Last Letter

Have you ever found yourself needing to manipulate strings in ways that go beyond simple reversal? One intriguing challenge is reversing each word in a string while excluding the last letter of each word. This task can seem daunting at first, especially if you're not clear on how to achieve this with programming. In this guide, we'll walk you through the problem and provide an effective solution using Java.

Understanding the Problem

Let's break down the requirements:

Input String: For example, "Hello how are you".

Desired Output: You want it to become "lleHo ohw rae oyu".

Key Point: You should reverse each word except the last letter.

Initially, it's easy to mistakenly reverse the whole word, resulting in outputs such as "olleH woh era uoy". So how do you avoid this?

Step-by-Step Solution

1. Overview of the Approach

To achieve the desired outcome, we'll follow these steps:

Replace multiple spaces with a single space.

Split the input string into an array of words.

Reverse each word, excluding the last character.

Reassemble the final string for output.

2. Implementing the Solution in Java

Here’s how you can implement the above logic in Java:

[[See Video to Reveal this Text or Code Snippet]]

3. Explanation of the Code

Here's a breakdown of the above code:

Input Handling: The original string is cleaned up to ensure there are no multiple spaces by using replaceAll.

Splitting the String: The string is split based on spaces into an array of words.

Processing Each Word:

For each word, we create a substring without the last character using substring.

A StringBuilder is used to reverse this substring.

Finally, the last letter is appended back to the reversed substring.

Assembling the Result: Each processed word is appended to a StringBuilder that builds the final result string, ensuring the output is neatly formatted when printed.

Conclusion

Reversing a string word by word while excluding the last letter is a wonderful exercise for practicing string manipulation in Java. The key steps involve careful handling of spaces, string slicing, and reversal techniques. By applying these principles, you can easily tackle similar string manipulation problems in your own programming endeavors.

Now you can implement this in your Java projects and amaze your friends with your string manipulation skills! Happy coding!